% define color
\definecolor{InvisibleRed}{rgb}{0.97, 0.92, 0.92}
\definecolor{InvisibleGreen}{rgb}{0.92, 0.97, 0.92}
\definecolor{InvisibleBlue}{rgb}{0.92, 0.92, 0.97}

\definecolor{MediumRed}{rgb}{0.925, 0.345, 0.345}
\definecolor{MediumGreen}{rgb}{0.37, 0.7, 0.66}
\definecolor{MediumBlue}{rgb}{0.015, 0.315, 0.45}

\definecolor{DarkBlue}{rgb}{0.05, 0.15, 0.35} 

% set color
\usecolortheme[named=DarkBlue]{structure}

\setbeamercolor{titlelike}{parent=structure}
\setbeamercolor{block title}{bg=MediumBlue}
\setbeamercolor{block body}{bg=InvisibleBlue}
\setbeamercolor{block title example}{bg=MediumGreen}
\setbeamercolor{block body example}{bg=InvisibleGreen}
\setbeamercolor{block title alerted}{bg=MediumRed}
\setbeamercolor{block body alerted}{bg=InvisibleRed}